Lewis & Short

Ărachnē, ēs, f., = Ἀράχνη (a spider).

  1. I. Myth., a Lydian maiden, who challenged Minerva to a trial of skill in spinning, and, as a punishment, was changed by the goddess into a spider, Ov. M. 6, 5 sq. (another form, Ărachnēa, ae, = Ἀράχνεια, like Calliopēa from Calliope, Manil. 4, 135).
  2. II. Arachne, a kind of sundial, Vitr. 9, 9.